I just tried all of the blade brands from the West Coast economy sample pack. If anyone is interested, here are the results:
Dorco - The least sharp of the group. Forgiving, but required an extra pass. Same as the K-mart blades I've bee using for months. A major improvement over American Personnas.
Red Pack Personna - If only American Personnas were this good. Sharpest in the group and very smooth. No nicks or weepers. Excellent blades.
Derby Extra - These are the reason I tried the sample pack. The first blade was a bad experience. It dragged across my face and tore me up. The second blade worked out much better, but still not any better than the Red pack or the Crystals. I am very disappointed, but every face is different...
Crystal - Almost identical to the Red Pack Personna. As sharp and perhaps a bit more aggressive. Some weepers, but a great blade.
Thanks to West Coast Shaving for the great and dirt-cheap sample pack. "Equipment" used - '59 Fatboy & KMF Mint cream.